Subject Index. 
0823 
15 Ccd. 
Embryology. 
The development of Hydra (including 
oogenesis, fertilization) ; Tannreuther, 
172. 
Histogenesis. 
Development and change of situation 
of the cnidoblasts (stinging-cells) of 
Hydroid polypes ; Hadzi, 65. 
Ueber den Septennachwuchs der Eu- 
psaraminen ; Marenzeller, 115. 
Larval forms. 
Two peculiar Actinian larvm from 
Tortugas, Florida ; Conklin, 36. 
Hypertrophie bei Actinienlarven ; 
Pax, 139. 
Pelagic larval forms of Actinians 
(Cerianthidae and Zoanthidae ) ; Senna, 
160. 
ETHOLOGY. 0819 
Habits: behaviour. 
Notes on biology of the Hydroid 
polyps of Cladonema ; Binder, 10. 
Behaviour of Harenactis attenuafa in 
altered environment ; Child, 29. 
Notes on the habits and biology of 
Limnoenida tanganyicae ; GUnther, 
63. 
Remarks on habitat and biology of 
Pennatulids ; Gravier, 5 . 
The habits of TAnerges mercurius ; 
Conklin, 35. 
Conditions of existence (limpidity of 
water, etc.) of Madreporarian corals of the 
genus Siderastraea ; Gravier, 58. 
Observations on the biology and mode 
of life of reef-building corals ; Gravier, 
57 & 60. 
Notes on habitat, mode of life, etc., of 
the reef-forming corals ; Hedley & 
Taylor, 72. 
Plankton. 
Black Sea, near Sebastopol, the Hydro- 
medusan Cytaeis octopunctata ; Markow, 
119. 
Medusae of the western A tlantic. With 
note on the occurrence of Cassiopaea 
xamachana and Folyclonia frondosa 
at the Tortugas ; Perkins, 144. 
Medusae and Siphonophora, as illus- 
trations of plankton organisms capable 
of changing their vertical level ; 
Woltereck, 197. 
Symbiosis. 
Interesting examples of symbiotic 
associations between certain Palaeozoic 
corals and other fossil animals (worms, 
barnacles, etc.), as illustrative of the 
beginnings of dependent life ; Clarke, 31. 
Syrnbiose zwischen einem Fisch 
Minous inermis und einem H}^droid- 
polypen (Stylactes minor) gefunden an 
der Ostkiiste Japans ; Franz und 
Stechow, 51. 
VARIATION AND PHYLOGENY. 
0823 
Evolution. * 
The Hydroid or the Medusa the more 
primitive form of the Hydromedusae? 
Nutting, 131a. 
Affinities of the ArcJiaeoeyathinae, to 
both Porifera and Coelenterates ; pos- 
sibly an ancestral connecting link 
between these two phyla ; Taylor, 173. 
Phylogeny. 
Affinities between Scypliistoma and 
Hydra indicated by the development of 
a new form, Taeniolhydra roscofensis ; 
H4rouard, 75. 
Discussion of the affinities of Limno- 
C7iida, on the one hand to Narcomedusae 
and on the other to Trachomedusae and 
Limnocodium ; GUnther, 63. 
On the phylogeny of Graptolites ; 
Ruedemann, 158. 
Beitrage zur Phylogenle der Tubo- 
corallier; Gerth, 52. 
